<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <link rel="stylesheet" href="bootstrap/css/bootstrap.min.css" />
  </head>
  <body>
    <input type="text" name="" id="" />
    <br />
    <select name="" id="">
      <option value="">上海</option>
      <option value="">北京</option>
    </select>
  </body>
</html>
